Figure 1: Durometer Chart
There are several methods for testing the hardness of a coating. One common test method used in both field and lab settings is ASTM D2240 – Durometer Hardness. According to ASTM International, Durometer Hardness determines indentation hardness of substances classified as thermoplastic elastomers, vulcanized (thermoset) rubber, elastomeric materials, cellular materials, gel-like materials, and some plastics.
